1. Chemical Warfare
Unit 2 – Chem B

2. What is the balanced equation for the decomposition of hydrogen peroxide into water and oxygen gas?
2H2O2  2H2O + O2

3. What does the abbreviation STP stand for?
Standard Temperature & Pressure

4. One mole of a compound contains how many particles?
6.02x1023 particles

5. One mole of carbon has a mass of how many grams?

6. 6.02x1023 is also known as
Avagodro’s Number

7. The sum of the masses of the elements composing a compound is known as its
Formula Mass

8. One mole of any gas has what molar volume?
22.4 Liters

9. The mass of each element in a compound divided by the formula mass is the
Percent composition

10. What is the percent composition of CO2?

11. Write the balanced formula for the reaction of iron with oxygen gas to form iron (III) oxide.
4Fe + 3O2  2Fe2O3

12. If 4.3g of iron reacts with oxygen, as in the previous formula, what mass of Fe2O3 would be produced?
6.1 g Fe2O3
4.3g Fe
1mol Fe
2mol Fe2O3
160g Fe2O3
56g Fe
4mol Fe
1mol Fe2O3

13. How many liters of oxygen are required for the previous reaction?
1.29 L O2
4.3g Fe
1mol Fe
3mol O2
22.4 L O2
56g Fe
4mol Fe
1mol O2

14. Aluminum reacts with bromine gas to produce aluminum bromide
Aluminum reacts with bromine gas to produce aluminum bromide. What is the balanced equation for this reaction?
2Al + 3Br2  2AlBr3

15. What type of reaction is the one previously written
What type of reaction is the one previously written? 2Al + 3Br2  2AlBr3
Synthesis reaction

16. If 15.0g Al reacts with 46.0g Br2, which is the limiting reactant?
1mol Al
2mol AlBr3
267g AlBr3
27g Al
2mol Al
1mol AlBr3
= 148.3g
46.0g Br2
1mol Br2
2mol AlBr3
267g AlBr3
160g Br2
3mol Br2
1mol AlBr3
= 51.2g

17. Find the empirical formula for the compound that consists of 20
Find the empirical formula for the compound that consists of 20.23% Al and 79.77% Cl.
AlCl3
20.23g Al
1mol Al
= .75 mol Al
27g Al
= 1
.75
= 3
79.77g Cl
1mol Cl
= 2.28 mol Cl
35g Cl
.75

18. Al2Cl6 AlCl3 formula mass = 132 264/132 = 2
If the molar mass of the compound in the previous question is 264g, what is the molecular formula?
Al2Cl6
AlCl3 formula mass = 132
264/132 = 2

19. For the formula 2P + 3Br2  2PBr3, if 5
For the formula 2P + 3Br2  2PBr3, if 5.0g P and 35g of Br2 react, what is the limiting reactant and how what mass of PBr3 is produced?
35g Br2 produces 39.5g PBr3
5.0g P
1mol P
2mol PBr3
271g PBr3
31g P
2mol P
1mol PBr3
= 43.7g
35g Br2
1mol Br2
2mol PBr3
271g PBr3
160g Br2
3mol Br2
1mol PBr3
= 39.5g

20. If the actual yield of PBr3 from the previous problem is 30g, what is the percent yield?
75.9%
30g/39.5g

21. Criss cross the ionic charges
In the writing of an ionic compound, how do we determine the number of each atom in the compound?
Criss cross the ionic charges

22. What law are we following when we balance a chemical equation?
Law of Conservation of Mass

23. Balance the following equation: Ca(ClO3)2  CaCl2 + O2

24. What is the formula for: iron (III) carbonate?
Fe2(CO3)3

25. Write the balanced equation for the following word equation: Aluminum chloride + Calcium  Aluminum + Calcium chloride
2AlCl3 + 3Ca  2Al + 3CaCl2